package net.lzzy.practices.web.courses;

import net.lzzy.practices.constants.ApiConstant;
import net.lzzy.practices.constants.Messages;
import net.lzzy.practices.entities.Course;
import net.lzzy.practices.entities.User;
import net.lzzy.practices.services.CourseService;
import net.lzzy.practices.services.UserService;
import net.lzzy.practices.utils.StringUtil;
import net.lzzy.practices.web.models.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;

/**
 * @author admin
 */
@RestController
@CrossOrigin //用于处理跨域资源共享
@RequestMapping(ApiConstant.ROUTE_COURSE_ROOT)
public class CourseApiController {
    private final CourseService service;

    private final UserService uService;


    @Autowired
    public CourseApiController(CourseService service, UserService uService) {
        this.service = service;
        this.uService = uService;
    }

    @GetMapping(ApiConstant.ROUTE_COURSE_ALL)
    public ApiResult getCourses(@RequestParam String token){
        List<VmCourse> courses = new ArrayList<>();
        service.get().forEach(course -> courses.add(VmCourse.create(course, false)));

        return new ApiResult(true,courses.size()+"",courses);
    }


    @GetMapping(ApiConstant.ROUTE_COURSE_OPEN)
    public ApiResult getOpenCourses(@RequestParam String token){
        List<VmCourse> courses = new ArrayList<>();
        service.get(true).forEach(course -> courses.add(VmCourse.create(course, false)));

        return new ApiResult(true,courses.size()+"",courses);
    }


    @GetMapping(ApiConstant.ROUTE_COURSE_OPEN_PAGE)
    public ApiResult getPagedCourses(@RequestParam String token,@RequestParam int page,@RequestParam int size){
        List<VmCourse> courses = new ArrayList<>();
        service.get(page,size).forEach(course -> courses.add(VmCourse.create(course, false)));

        return new ApiResult(true,courses.size()+"",courses);
    }

    @GetMapping(ApiConstant.ROUTE_COURSE_OPEN_PAGE)
    public ApiResult getPagedOpenCourses(@RequestParam String token,@RequestParam int page,@RequestParam int size){
        List<VmCourse> courses = new ArrayList<>();
        service.get(page,size,true).forEach(course -> courses.add(VmCourse.create(course, false)));

        return new ApiResult(true,courses.size()+"",courses);
    }

    @GetMapping(ApiConstant.ROUTE_COURSE_TEACHER)
    public ApiResult getTeacherCourses(@RequestParam String token, @RequestParam (name = "id") UUID teacherId){
        List<VmCourse> courses = new ArrayList<>();
        service.getTeachersCourses(teacherId).forEach(course -> courses.add(VmCourse.create(course, true)));

        return new ApiResult(true,courses.size()+"",courses);
    }

    @GetMapping(ApiConstant.ROUTE_COURSE_STUDENT)
    public ApiResult getStudentCourses(@RequestParam String token,@RequestParam (name = "id") UUID studentId){
        List<VmCourse> courses = new ArrayList<>();
        service.getStudentsCourses(studentId).forEach(course -> courses.add(VmCourse.create(course, false)));

        return new ApiResult(true,courses.size()+"",courses);
    }

    private ApiResult addOrUpdate(UUID id, CourseInfo info){
        String token = info.getToken();
        String name = info.getName();
        String desc = info.getDesc();
        String cover =info.getCover();
        String teacherId = info.getTid();
        boolean open = info.isOpen();
        if (StringUtil.isEmpty(name) ||
                StringUtil.isEmpty(desc) ||
                StringUtil.isEmpty(teacherId)){
            return new ApiResult(false, Messages.MISS_ARGS.toString(),null);
        }
        User teacher = uService.getById(UUID.fromString(teacherId));
        if(teacher == null) {
            return new ApiResult(false, Messages.WRONG_ID.toString(),null);
        }
        Course course;
        boolean add = id ==null;
        if (add){
            course = new Course();
            course.setTeacher(teacher);

        }else {
            course = service.getById(id);
            if (course == null){
                return new ApiResult(false,Messages.WRONG_ID.toString(), null);
            }
        }
        course.setUpdateTime(new Date());
        course.setOpen(open);
        course.setName(name);
        course.setCover(cover);
        course.setDescription(desc);
        if (add){
            return new ApiResult(true,Messages.SUCCESS.toString(), VmCourse.create(service.add(course),true));

        }else {
            Course updated = service.update(course,token);
            if(updated == null) {
                return new ApiResult(false,Messages.NO_PERMISSION.toString(),null);
            }
            return new ApiResult(true,Messages.SUCCESS.toString(),VmCourse.create(updated,true));
        }
    }

    @PostMapping(ApiConstant.ROUTE_COURSE_ADD)
    public ApiResult add(@RequestBody CourseInfo info){
        return addOrUpdate(null,info);
    }

    @PutMapping(ApiConstant.ROUTE_COURSE_PUT)
    public ApiResult update(@PathVariable UUID id,@RequestBody CourseInfo info){
        return addOrUpdate(id,info);
    }

    @PostMapping(ApiConstant.ROUTE_COURSE_OPEN_CLOSE)
    public ApiResult openClose(@RequestBody CourseOpenInfo info){
        String token = info.getToken();
        String strCourseId = info.getCid();
        boolean open = info.isOpen();
        if(StringUtil.isEmpty(token) || StringUtil.isEmpty(strCourseId)){
            return new ApiResult(false,Messages.MISS_ARGS.toString(), null);
        }
        Course course = service.openCloseCourse(UUID.fromString(strCourseId),open,token);
        if (course == null){
            return new ApiResult(false,Messages.NO_PERMISSION.toString(), null);

        }
        return new ApiResult(true,Messages.SUCCESS.toString(),VmCourse.create(course,true));
    }

    @DeleteMapping(ApiConstant.ROUTE_COURSE_REMOVE)
    public ApiResult delete(@RequestBody CourseKeyInfo info){
        String token = info.getToken();
        String strCourseId = info.getCid();
        if (StringUtil.isEmpty(token) || StringUtil.isEmpty(strCourseId)){
            return new ApiResult(false,Messages.MISS_ARGS.toString(), null);
        }

        try{
            UUID courseId = UUID.fromString(strCourseId);
            Messages msg = service.remove(courseId,token);
            return new ApiResult(msg == Messages.SUCCESS, msg.toString(), null);
        }catch (Exception e){
            return new ApiResult(false,Messages.WRONG_ID.toString(),null);
        }

    }



}